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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div id="wrap">
  <ul id="slider">
    <li class="slide-item"><img data-lazy="http://blanks.site/assets/images/uploads/post19_1.jpg" alt="画像"></li>
    <li class="slide-item"><img data-lazy="http://blanks.site/assets/images/uploads/post19_2.jpg" alt="画像"></li>
    <li class="slide-item"><img data-lazy="http://blanks.site/assets/images/uploads/post19_3.jpg" alt="画像"></li>
    <li class="slide-item"><img data-lazy="http://blanks.site/assets/images/uploads/post19_4.jpg" alt="画像"></li>
    <li class="slide-item"><img data-lazy="http://blanks.site/assets/images/uploads/post19_5.jpg" alt="画像"></li>
    <li class="slide-item"><img data-lazy="http://blanks.site/assets/images/uploads/post19_6.jpg" alt="画像"></li>
  </ul>
  <ul id="thumbnail-list">
    <li class="thumbnail-item"><img src="http://blanks.site/assets/images/uploads/post19_1.jpg" alt="画像"></li>
    <li class="thumbnail-item"><img src="http://blanks.site/assets/images/uploads/post19_2.jpg" alt="画像"></li>
    <li class="thumbnail-item"><img src="http://blanks.site/assets/images/uploads/post19_3.jpg" alt="画像"></li>
    <li class="thumbnail-item"><img src="http://blanks.site/assets/images/uploads/post19_4.jpg" alt="画像"></li>
    <li class="thumbnail-item"><img src="http://blanks.site/assets/images/uploads/post19_5.jpg" alt="画像"></li>
    <li class="thumbnail-item"><img src="http://blanks.site/assets/images/uploads/post19_6.jpg" alt="画像"></li>
  </ul>
</div>
            
          
!
            
              #wrap{
  background-color: #333;
  display: flex;
  flex-direction: column;
  justify-content: center;
  height: 100vh;
}
#slider{
  width: 300px;
  margin:0 auto 30px;
}
.slide-item{
  img{
    width: 100%;
  }  
}
#thumbnail-list{
  width: 300px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap:wrap;
}
.thumbnail-item{
  flex: 0 1 30%;
  margin-bottom: 10px;
  box-sizing: border-box;
  position:relative;
  &:after{
    content:'';
    background-color: rgba(0,0,0,0.5);
    position:absolute;
    display: block;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 1;
    transition: .3s opacity linear;
  }
  &.thumbnail-current:after{
    opacity: 0;
  }
  img{
    width: 100%;
    margin: 0 auto;
  } 
}

            
          
!
            
              $(function(){
  var slider = "#slider"; // スライダー
  var thumbnailItem = "#thumbnail-list .thumbnail-item"; // サムネイル画像アイテム
  
  // サムネイル画像アイテムに data-index でindex番号を付与
  $(thumbnailItem).each(function(){
   var index = $(thumbnailItem).index(this);
   $(this).attr("data-index",index);
  });
  
  // スライダー初期化後、カレントのサムネイル画像にクラス「thumbnail-current」を付ける
  // 「slickスライダー作成」の前にこの記述は書いてください。
  $(slider).on('init',function(slick){
   var index = $(".slide-item.slick-slide.slick-current").attr("data-slick-index");
   $(thumbnailItem+'[data-index="'+index+'"]').addClass("thumbnail-current");
  });

  //slickスライダー初期化  
  $(slider).slick({
    autoplay: true,
    arrows: false,
    fade: true,
    infinite: false //これはつけましょう。
  });
  //サムネイル画像アイテムをクリックしたときにスライダー切り替え
  $(thumbnailItem).on('click',function(){
    var index = $(this).attr("data-index");
    $(slider).slick("slickGoTo",index,false);
  });
  
  //サムネイル画像のカレントを切り替え
  $(slider).on('beforeChange',function(event,slick, currentSlide,nextSlide){
    $(thumbnailItem).each(function(){
      $(this).removeClass("thumbnail-current");
    });
    $(thumbnailItem+'[data-index="'+nextSlide+'"]').addClass("thumbnail-current");
  });
});
            
          
!
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